5 Questions to Ask When Hiring a Contractor For Mold Removal

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women-mold-allergyMold can cause a variety of health problems for occupants as well as weaken the stability of a home or building.  If you have tried cleaning the mold yourself and continue to smell the mold or mildew, hiring a mold remediation company is usually necessary, but you don’t want to speed through or gloss over selecting the right contractor for the job.  Whether you are a homeowner or a property manager, hiring an inexperienced company or someone with sub-par practices can put you and your occupant’s health at risk and expose the property’s owner to liability. 

Here are 5 questions to ask when hiring a suitable company for your job.

1. What is your background?

I think you’ll agree with me when I say experience and reputation matter a great deal. How long has the company been around?  Are they well-established?  Are they accredited?  What do their customers say about their service?  Are they licensed, bonded, and insured?  Here’s why these questions are important, whether you own a house or a building it is an expensive asset that you want to protect.  Therefore, hire a well-established company (ten or more years in business) that has a lot of qualified experience and read the most recent reviews from their clientsHow many positive reviews do they have?  What do their clients say about their timeliness, professionalism, communication, knowledge, cost, and customer service? attractive-background-beautiful-beauty-business-businesswoman-cafe-casual-caucasian-center-coffee_t20_vR4wr6

2. What is your process for mold remediation?

Now this is imperative, a knowledgeable company will first identify and locate the source of the moisture intrusion that allowed the mold to grow in the first place, then they will construct a detailed plan with steps to correct the issue and remove the mold.  An expert company will also have extensive insight of proper ventilation, roofing products, insulation, and current mold remediation best practices to keep your home or building’s indoor air healthy.

Unfortunately, not all mold remediation methods are effective or follow EPA recommended guidelines.  Stay clear of any company that does not set up containment or claims fogging or spraying a chemical into the air will remove the mold.  There are also contractors who will paint over the mold or apply Kilz®.  Proper remediation does not work that way.  The mold must be physically removed from the surface to prevent human exposure and damage to the building materials. Some contractors may choose to sand or scrape the mold away – today there are much better ways to remove the hyphae (root of the mold) that are not as labor intensive and costly.  Containment is most always necessary to prevent cross-contamination to other areas of the home or building to keep indoor air healthy.  Pro Tip – fogging the air to remove airborne mold spores is a good practice following mold remediation and/or applying a clear mold & mildew stain-blocking product.


3. What kind of warranty do you offer for your work?

If you choose to work with a company that has only been in business a few months or even a couple of years you may be taking a huge risk with any warranty they offer you.  According to the Chamber of Commerce, “50% of small businesses fail during the first five years; even more concerning construction companies have a 75% fail rate during the first year”.  Therefore, a warranty offered by a new company may not be a dependable choice compared to a company that has been around for ten or more years.

Likewise, any company that may claim to remove 100% of mold from your home or building is not being factual as it is physically impossible to remove all mold spores because they are always around us. The goal of mold remediation is to bring the mold spore count to a normal, healthy level and to eliminate what is causing the mold to grow. 

4.  How much does mold remediation cost?

The costs for mold remediation can vary depending on the location of the mold, how much is present, and what is needed to correct the moisture intrusion(s).  A simple bathroom project under one hour can cost around $500 or less or a community of apartment buildings can average upwards of $25,000 or more.  Be aware that bids from an emergency service or restoration company can be much higher.  For example, a water leak that occurs in the middle of the night may require immediate assistance and may cost more for mold remediation in addition to water mitigation.   Pro Tip – once the emergency company can get the water leak under control, contact an experienced mold expert to assist with the mold removal portion of the job; this will save you time and money.  Likewise, restoration companies will often suggest tearing out and replacing building materials instead of cleaning them which can double the costs for materials/labor and extend the time necessary for your project.  Mold contractors are specialists in this field for a reason and can expertly clean the mold with a much faster turnaround time.

5. What can I expect from you? 

Just like any contractor you work with; you’ll want to confirm your expectations from the start. The contractor should establish how they expect to communicate with you (phone, text, email, etc.) and the expected timeline for remediation. They should review the written estimate with you, patiently answer your questions, and secure a contract for the agreed upon work.  A seasoned mold company will also help you learn pro tips on how to avoid mold issues in the future.

Certified Indoor Environmental is an industry leader with more than 10 years of experience, and specializes in non-destructive mold remediation, ventilation analysis & corrections, asbestos testing & removal, and indoor air quality (IAQ) testing & improvements. Certified has helped thousands of homeowners, brokers, and property managers eliminate problems in their homes/buildings, including all types of molds that develop in our wet northwest environment.  As a result they have received over 1,600 5-star reviews!

CIE_stacked_logoCheck out Certified’s Answers

to The questions Above…

Why Choose Certified Indoor Environmental?

1 – What is your background?

  • We have been in business for over 10 years!
  • We have assessed and remediated over 18,000 attics.
  • We are licensed, bonded, and insured.
  • We have over 1,800 5-star reviews!!! Check out what our clients have to say about us!

2 – What is your process for mold remediation?

  • Our project managers are knowledgeably trained to use a 10-step investigative process to identify the moisture source and we also have skilled technicians that can correct the problem whether it is ventilation/tight-lining, opening a wall/roof and repairing, or advising of lifestyle issues.
  • Our project managers are knowledgeably trained to use a 10-step investigative process to identify the moisture source and we also have skilled technicians that can correct the problem whether it is ventilation/tight-lining, opening a wall/roof and repairing, or best practices for limiting mold growth potential.
  • Our non-destructive mold removal system removes the hyphae (mold root) instantly from most building materials such as drywall and attic sheathing. This video (on right) shows our attic and interior mold removal method – split second results!

How do we get instant results?  We use the latest mold remediation methods including a uniquely formulated mold stain remover with a proprietary additive making it non-corrosive.  Without this special blend, rust can occur over time with other “copycat” methods. 

  • We can also apply a CLEAR coating after the mold is removed to protect the building material. Many companies will paint over with a white paint or KILZ®, so you cannot see if the mold was completely removed.
  • We set up proper containment before mold remediation and fog the space to remove mold spores that can be activated during remediation. Our indoor air quality testing ensures the fogging has biodegraded (usually after 3 hours) and the indoor air is safe for return. 

3 – What kind of warranty do you offer for your work?

We offer a 5-year warranty.

4 – How much does mold remediation cost?

Please call for a free estimate today! 503.610.3661

5 – What can I expect from you? 

Please read our reviews!  We have a knowledgeable team that can answer your questions from your first phone call.  Other companies may not answer or will have a project manager call you back; that is not the case with us.  Our entire team is knowledgeable from beginning to the end of your project.  Customer service is our #1 company value, and we focus on clear communication and professional service.  Visit our website to learn more! 

Do you have more questions?  No problem…. contact us today!  

Phone:   503.610.3661 | Email:  Info@certifiedie.com


CIE | Author – Lynette Schmidt, Business Development Manager | November 3, 2021


Mark Ritacco, Managing Partner at Certified Indoor Environmental |  “Protect Your Assets From Mold Liability” CE Class/Presentation and “Attic Mold – A Guide to Proper Remediation and Prevention”, author Mark Ritacco.

Home Advisor, The Step-by-Step Guide to Finding, Hiring and Working with Contractors

The Hartford Staff, 4 Practices to Follow When Hiring Construction Labor and Subcontractors

The Chamber of Commerce, What Is the Success Rate of Small Businesses

Related Links:

Attic Remediation Video

Inadequate Ventilation May Be The Reason You Need A New Roof

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